linux-ext4 - [Bug 14354] Bad corruption with 2.6.32-rc1 and upwards

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Message-Id: <200910131512.n9DFC51T025318@demeter.kernel.org>
Date:	Tue, 13 Oct 2009 15:12:05 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 14354] Bad corruption with 2.6.32-rc1 and upwards

http://bugzilla.kernel.org/show_bug.cgi?id=14354





--- Comment #35 from Alasdair G Kergon <agk@...hat.com>  2009-10-13 15:12:04 ---
We used to issue EOPNOTSUPP in response to barriers (so flushing ceased to be
supported when it became barrier-based). 'Basic' barrier support was added
first (2.6.30-rc2), as Mike says, by waiting for relevant I/O to complete. 
Then this was extended (2.6.31-rc1) to send barriers to the underlying devices
for most dm types of dm targets.

To see which dm targets in a particular source tree forward barriers run:
  grep 'ti->num_flush_requests =' drivers/md/dm*c
(set to a non-zero value).

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